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Mosqueira has over 15 years of experience as a pen-and-paper designer and RPG writer with over 20 titles to his credit for White Wolf, Steve Jackson Games, and Dream Pod 9. He also served in the Black Watch (Royal Highlanders of Canada) Regiment for eight years. Before arriving at Blizzard, he held positions at Ubisoft Montreal, Relic Entertainment, and Vicarious Visions. His experience as a creative director, design director, and lead designer has spanned numerous genres, including real-time strategy games, first-person shooters, and action games. His prior credits include Far Cry 3, Company of Heroes, Warhammer 40,000: Dawn of War, and Homeworld 2.[2] He worked with Jay Wilson as part of the Company of Heroes team.[3]

Mosqueira joined Blizzard Entertainment in May of 2011.[2] In 2013, he replaced Jay Wilson as Diablo III's game director.[4] As game director for Team 3, Mosqueira was responsible for overseeing the overall game design of the Diablo franchise, including its transition to a new platform and for a new audience. This involved maintaining the game’s creative vision, and overseeing a team of designers as they refined the game’s critically acclaimed gameplay experience.[2] He specified the setting, protagonist, and antagonist of Reaper of Souls, wanting the two to balance out.[5]

In December, 2014, Mosqueira and other members of Team 3 provided consultation with Bungie on the development of The Taken King, as Activision had noticed similar complaints leveled at Destiny as the original version of Diablo III.[6]

He left Blizzard Entertainment on July 1, 2016.[7] He is currently a member of Bonfire Studios.[8]